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Casual games publisher King.com is today announcing it has passed one billion gameplays per month and is now one of the top 10 largest developers on Facebook’s social network. The company, which offers nearly 200 multi-platform games in 14 languages, is also expanding its reach in North America with the opening of new offices in San Francisco.

The San Francisco office will be located downtown and will serve as the operations center for all North American business development initiatives for the company. Jong Woo is joining the U.S. office as senior business development director for the U.S. from his previous position as senior business development executive at Blockdot, an interactive agency specializing in branded entertainment and “advergaming.” Prior to Blockdot, Woo served as President of casual game publisher Gamelab, makers of “Diner Dash” and “Jojo’s Fashion Show.”

Over the past month, King.com’s “Saga” games (Bubble Saga and Bubble Witch Saga) have generated over 600 million gameplays on Facebook alone. In total, the company is now seeing 17.6 million monthly active users on Facebook, it says. (Source: AppData, Oct. 25th).

Going forward, King.com’s week-old Romanian office will be the center of its mobile game development operations. Here, the focus will be on porting its most popular games to iPhone and Android. CEO Riccardo Zacconi tells me that there are already two games in the development pipeline which will launch on mobile by year-end.

The company also has offices in London, Hamburg, Stockholm and Milan.

King.com was founded in 2003 with a focus on casual gaming in Europe and the U.S. In April, it launched a platform for porting its games to Facebook. There are currently three King.com games on Facebook, and more will be on the way soon.